OI: Practice is done by sportspersons, musicians, artists and so on. However, for leaders, once we have the knowledge, we can deliver.
NI: Leadership is a performance art. To learn leadership, we need to know the concepts (the science), and then practice to become masterful in the art.
One way of engaging with life and the world is through abstractions, thinking and reflections, but the mastery of action is always from embodied skill.